Patent US3384570A successfully refreshed from Google Patents.
US4201802A
Expired / Lapsed
US
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Process for manufacturing prefinished hardboard
Assignee: Lilly Industries Inc
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Filing: 1978-04-21
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Granted: 1980-05-06
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Expires: 1998-04-21
Abstract
Abstract A process for manufacturing prefinished hardboard includes the use of a pre-press sealer comprising an aqueous mixture of a polyvinyl alcohol polymer in conjunction with emulsified fatty acid and/or fatty esters, an amine or similar emulsifier, and aluminum stearate. The pre-press sealer provides excellent sealing and hardening fiber binding to the porous fiberboard surface as well as improving the release from the press after the fiberboard is formed in a press under heat and pressure.
Inventors
- 👤 Joseph A. Vande Kieft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:21
CPC Classifications
B; B27; B27N; B27N3/00; B27N3/08; B27N3/083; C; C08; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/10; C08K5/16; C08K5/17; C08L; C08L97/00; C08L97/02; C08L2205/00; C08L2205/06; C08L29/00; C08L29/02; C08L29/04; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
In a process for molding prefinished fiberboard products under heat and pressure comprising: providing a plurality of layers of fiberboard stock material in the form of a non-consolidated preformed fiberboard product; coating the surface of said preformed fiberboard with an aqueous pre-press sealer being resinous material dispersed in water and comprising by weight on a film-forming solids basis between about 30% and 50% of a copolymer containing by weight at least 95% copolymerized vinyl alcohol, 10% and 25% emulsified fatty acid and/or fatty acid ester, 1% and 5% volatile amine emulsifier and 5% and 10 % aluminate stearate, and at least about 15% water; hot pressing said preformed fiberboard containing surface sealer at temperatures of at least about 100° C. within a press for time sufficient to consolidate said preformed fiberboard into a solid fiberboard product having a sealed top surface; and releasing said sealed fiberboard product from the press surface without sticking of the fiberboard product surface to the press surface.
Claim 2
Dependent Claim
162 words
In a process for molding prefinished fiberboard products under heat and pressure comprising: providing a plurality of layers of fiberboard stock material in the form of a non-consolidated preformed fiberboard product; coating the surface of said preformed fiberboard with an aqueous pre-press sealer being resinous material dispersed in water and comprising by weight on a film-forming solids basis between about 30% and 50% of a copolymer containing by weight at least 95% copolymerized vinyl alcohol, 10% and 25% emulsified fatty acid and/or fatty acid ester, 1% and 5% volatile amine emulsifier and 5% and 10 % aluminate stearate, and at least about 15% water; hot pressing said preformed fiberboard containing surface sealer at temperatures of at least about 100° C. within a press for time sufficient to consolidate said preformed fiberboard into a solid fiberboard product having a sealed top surface; and releasing said sealed fiberboard product from the press surface without sticking of the fiberboard product surface to the press surface.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-05-06 | 1983-11-05 | 1984-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-06 | 1987-11-05 | 1988-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-06 | 1991-11-05 | 1992-05-06 | $7700.00 | Window Closed / Lapsed |